I agree, it's actually a pretty goo article.
Very few hunters will ever shoot at anything beyond 200yds, and as noted above have very limited experience and no instruction from anyone who was competent enough to give it.
He does a good job of talking about what it does take to push out beyond 400 and 600yds and does a good job of it.
In THIS crowd, we don't think of long range as being anything inside of 600yds, but in reality, we are the "one percenters" the one percent of hunters crazy enough to think we can and who are willing to invest the time and money to constantly push the limits of what we ourselves even think is possible.
One thing I think he doesn't account for is the huge number (relatively speaking) of combat veterans we've had over the last ten years who have a great deal of 300yds plus trigger time who are now taking to the hunting field prepared, trained, and well practiced in the art of long range shooting.
We haven't had an influx of competent trained shooters into the civilian populous like this in more than a generation.